St Stephen's Green, a division of Dublin, was a borough constituency in Ireland. It returned one Member of Parliament (MP) to the United Kingdom House of Commons from 1885 until 1922 on the first past the post electoral system.

From the dissolution of 1922, shortly before the establishment of the Irish Free State, the area was no longer represented in the UK Parliament.

This constituency was named for St Stephen's Green and comprised parts of the south-east of the city of Dublin.^[1]

From 1885 to 1918, it was defined as:^[2]

Exchange Ward, Fitzwilliam Ward, Mansion House Wards, and those parts of the South Dock and Trinity wards not contained within the Dublin Harbour constituency, and that part of the parliamentary borough outside of the municipal borough boundary not contained within the Dublin Harbour constituency.

From 1918 to 1922, it was defined as:^[3]

the Royal Exchange, Fitzwilliam and Mansion House wards and those parts of the South Dock and Trinity wards not contained within the Dublin Harbour constituency.

Prior to the 1885 general election, the city was the undivided two-member Dublin City constituency. Under the Redistribution of Seats Act 1885, Dublin was divided into four divisions: College Green, Dublin Harbour, St Stephen's Green, and St Patrick's. Under the Redistribution of Seats (Ireland) Act 1918, the city was allocated seven seats: in addition to the four existing constituencies, the new divisions were Clontarf, St James's and St Michan's.^[4]

Sinn Féin used the 1918 general election to elect members of Dáil Éireann, inviting all those elected in Ireland to sit as a Teachta Dála (known in English as a Deputy) in the Dáil rather than at Westminster, although only the Sinn Féin members attended. Thomas Kelly sat as a member of the First Dáil.

Under the Government of Ireland Act 1920, the area was combined with the St Patrick's Division to form Dublin South, a 4-seat constituency for the Southern Ireland House of Commons and a single constituency at Westminster.^[5] At the 1921 election for the Southern Ireland House of Commons, the four seats were won uncontested by Sinn Féin, who treated it as part of the election to the Second Dáil. Thomas Kelly was one of the four TDs for Dublin South.

Under s. 1(4) of the Irish Free State (Agreement) Act 1922, no writ was to be issued "for a constituency in Ireland other than a constituency in Northern Ireland".^[6] Therefore, no vote was held in Dublin South at the 1922 United Kingdom general election on 15 November 1922, shortly before the Irish Free State left the United Kingdom on 6 December 1922.